[linux-audio-dev] ANN: Distributed LADSPA Processing

Hi, Have you ever wondered if it is possible to escape the limits imposed by your cpu to the number of ladspa plugins you can run simultaneously, while keeping latency low? Well, yes, there is. This email is to let you know about DLADSPA (Distributed LADSPA). While there are a few rough edges on the code, there has been some talk related to it on this list and so I'm bringing it to the table. DLADSPA allows you to group several LADSPA plugins on a chain that appears as a single "meta-plugin". This meta-plugin is loaded by your application as any other plugin, but in fact it loads the "real" plugins in the chain on a remote machine and sends the data for remote processing at each interaction. There are some limitations: - the system needs every period to be the same size (unless you are not running in real-time or the remote load is *very* low, but then what is the point?). - The system adds to the latency the equivalent of a single period. That is, if your period size is 2ms for a total input-to-output latency of 4ms, the system adds another 2ms to the latency, so total latency goes to 6ms. - You cannot define the chain of plugins to be loaded remotely from within your application; that needs to be done separately (using jack-rack), the chain must be saved and the application restarted. - right now, there is a simple GUI missing, configuration is complicated thanks to a corba layer that needs to be eliminated, the code is tricky to compile (but it *does* compile on debian stable) and error handling is non-existant (any error calls exit(), which means your app crashes). If jack udp transport doesn't work adequately (haven't tested it), I intend to adapt the code to work on top of jack too (should be reasonably easy). It is available at my homepage: http://gsd.ime.usp.br/~lago/masters Hope you enjoy it, Nelson ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.